HomeMy WebLinkAboutMaggie Valley Impact Maps2(MAX)1 STREAM BED ELEVATION12" (MIN) TO18" (MAX)
STREAM BED ELEVATIONTOP OF BANK ELEVATION2' (MIN)12" (MIN)2(MAX)12(MAX)112" (MIN)12" (MIN) TO18" (MAX)TOP OF BANK
TOP OF BANKPLANA
AB B
SECTION "B-B"
SECTION "A-A"
SPIKE DETAILTHREADED ROD DETAILMAT DETAIL
SECTION B-B NOTES:1.KEEP CLEARING AND EXCAVATION OF THE STREAM BANKS AND BED ANDAPPROACH SECTIONS TO A MINIMUM.2.CLEARING WITHIN 10 FT OF THE STREAM BANK SHALL BE DONE BY CUTTINGNOT GRUBBING. THE ROOTS AND STUMPS SHALL BE LEFT IN PLACE TO HELPSTABILIZE THE BANKS AND ACCELERATE RE-VEGETATION.3.INSTALL A 6 INCH (MINIMUM) 'LIP' ALONG THE OUTSIDE OF THE BRIDGEMAT TOPREVENT LOOSE SEDIMENT FROM DEPOSITING IN STREAM DURINGCROSSING.4.INSTALL SILT FENCE ALONG TOPS OF BANKS AND TIE TO CROSSING.5.DIVERT ALL SURFACE WATER FROM THE CONSTRUCTION SITE ONTOUNDISTURBED AREAS ADJOINING THE STREAM.6.KEEP STREAM CROSSINGS AT RIGHT ANGLES TO THE STREAM FLOW.7.ALIGN APPROACHES WITH THE CENTER LINE OF THE CROSSING FOR AMINIMUM DISTANCE OF 30 FEET AND STABILIZE WITH 8" THICK LAYER OF 2"-3"WASHED STONE FOR A MINIMUM OF 50 FEET.8.STABILIZE ALL DISTURBED AREAS SUBJECT TO FLOWING WATER, INCLUDINGPLANNED OVERFLOW AREAS, WITH RIPRAP OR OTHER SUITABLE MEANS IFDESIGN VELOCITY EXCEEDS THE ALLOWABLE FOR THE IN-PLACE SOIL.9.USE A SKIDDER OR KNUCKLEBOOM TO INSTALL AND REMOVE MATS.10.PLACE MATS BETWEEN "BUMPER TREES" OR USE DEADMAN ANCHORS TOANCHOR ON BOTH BANKS.11.ENSURE THAT 1/4 (MINIMUM) OF THE MAT TOTAL LENGTH IS SUPPORTED ONEACH SIDE OF THE BANK.12.INSTALL WATER DIVERSION DEVICES ON BOTH SIDES OF THE CROSSING.13.BRIDGEMATS SHALL REMAIN IN PLACE UNTIL COMPLETION OF CONSTRUCTIONUNLESS THE CROSSING CAUSES EROSION DUE TO THE CROSSING OF THESTREAM CHANNEL. IF EROSION OCCURS THE CHANNEL BANKS SHALL BEPLACED BACK TO PRE-CONSTRUCTION CONDITIONS.14.UPON REMOVAL OF BRIDGEMAT RESTORE THE STREAM CHANNEL TO ITSORIGINAL CROSS-SECTION.15.SMOOTH AND STABILIZE ALL DISTURBED AREAS.PLAN
SECTION A-A
A
ABB
STREAM FLOW Þ56.1
FLOW
CROSS-SECTION TRAPEZIODAL DITCHCROSS-SECTION "V" DITCH
PLAN
INSET AINSET BINSET CNOTES:1.USE MINIMUM 12" DIAMETER EXCELSIOR WATTLES.2.USE 2' (24") WOODEN STAKES WITH 2" X 2" NOMINAL CROSS-SECTION.3.ONLY INSTALL WATTLES IN LOCATIONS SUCH THAT FLOW PASSES OVER THE WEIR FORMED IN THECENTER OF THE WATTLE AND NOT AROUND THE WATTLE, TO PREVENT EROSION.4.INSTALL A MINIMUM OF TWO (2) UPSLOPE STAKES AND FOUR (4) DOWNSLOPE STAKES AT AN ANGLETO "WEDGE" THE WATTLE TO THE GROUND.5.ADDITIONAL STAKES MAY BE REQUIRED TO SECURE THE WATTLE FIRMLY TO THE SOIL.6.INSTALL MATTING IN ACCORDANCE WITH NCDOT STANDARD SPECIFICATION SECTION 1631.7.*IF THE USE POLYACRYLAMIDE (PAM) IS SPECIFIED, OBTAIN A SOIL SAMPLE FROM PROJECTLOCATION AND FROM ANY OFFSITE BORROW AREA. ANALYZE SOIL SAMPLES FOR APPROPRIATEPAM FLOCCULANT TO BE APPLIED.8.INITIALLY, APPLY 2 OUNCES OF ANIONIC OR NEUTRALLY CHARGED PAM OVER WATTLE WHEREWATER WILL FLOW, AND ONE ONCE OF PAM ON MATTING ON EACH SIDE OF WATTLE. REAPPLYAFTER EVERY RAINFALL EVENT EXCEEDING 0.5" OF RAINFALL.9.ONLY POLYACRYLAMIDES FROM THE NCDEQ APPROVED LIST ARE TO BE USED.10.WATTLES SHALL BE SPACED IN DITCHES SUCH THAT THE TOP OF EACH WATTLE IS AT THEELEVATION OF THE BOTTOM OF THE WATTLE UPSTREAM OF IT, USING THE FORMULA [WATTLE DIA.(FT) X 1000 / SLOPE (%).11.WATTLE MATTING IS NOT REQUIRED WHERE DITCH IS TO BE COMPLETELY LINED WITH A ROLLEDEROSION CONTROL PRODUCT.COIR OR EXCELSIOR WATTLENOT TO SCALE46.3
No.
Checked By
Revision Designer
Drawn By
Date By Scale
Date
Job No.
Sheet No.WithersRavenel
$ngineers [ /lanners [ Surveyors
115 MacKenan Drive | Cary, NC 27511
t: 919.469.3340 | license #: F-1479 | www.withersravenel.com08221122.0
1.005/19/2023
AS NOTED
Town of Maggie Valley Haywood County North CarolinaSJM
KEW
KEW MAGGIE VALLEY WWTP
LEVEE REPAIR VICINITY MAP
0
SCALE: 1 inch =
500250
500 ft.
E
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SITE
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EXISTING 54" CMP
INV: 2489.59'
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EXISTING 54" CMP
INV: 2489.32'
TOP:2493.09'
REGULATORY
FLOODWAY PER
FIRM 3700860900J
1% ANNUAL
REGULATORY
FLOODWAY PER
FIRM 3700860900J
STREAM CENTERLINE
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IMPACT S2
TEMPORARY STREAM IMPACT
TEMPORARY CONSTRUCTION NORTHERN COFFERDAM
0.008 AC (364.46 SF); 12.16 LF
IMPACT S1
TEMPORARY STREAM IMPACT
TEMPORARY CONSTRUCTION ACCESS
0.087 AC (3781.70 SF); 167.70 LF
IMPACT S5
PERMANENT STREAM IMPACT
BANK STABILIZATION
0.024 AC (1059.59 SF); 102 LF
JO
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IMPACT S6
PERMANENT STREAM IMPACT
RIP RAP FILL
0.015 AC (671.32 SF); 95 LF
IMPACT S4
TEMPORARY STREAM IMPACT
TEMPORARY CONSTRUCTION ACCESS RAMP
0.003 AC (133.37 SF); 8.64 LF
IMPACT S3
TEMPORARY STREAM IMPACT
TEMPORARY CONSTRUCTION SOUTHERN COFFERDAM
0.006 AC (247.96 SF); 8.79 LF
No.
Checked By
Revision Designer
Drawn By
Date By Scale
Date
Job No.
Sheet No.WithersRavenel
$ngineers [ /lanners [ Surveyors
115 MacKenan Drive | Cary, NC 27511
t: 919.469.3340 | license #: F-1479 | www.withersravenel.com08221122.0
2.07/21/2023
AS NOTED
Town of Maggie Valley Haywood County North CarolinaSJM
KEW
KEW MAGGIE VALLEY WWTP
LEVEE REPAIR STREAM IMPACT MAP
IMPACT LEGEND
TEMPORARY STREAM IMPACT
PERMANENT STREAM IMPACT
0
SCALE: 1 inch =
3015
30 ft.
E
N
W
S